The main issue is not related to LACP, but to how L2 (with SVI) and L3 ports handle spanning tree:
If you configure the link as L2 and configure an SVI, you will be running spanning tree on the Etherchannel (if it is enabled). This could have implications such as a 30 second delay before the Etherchannel transitions to Forwarding when it is brought up. If there is link instability, this would delay the link recovery time each time it bounces. Also consider the STP mode the switch is running. If it operates as CST (STP/RSTP), the Etherchannel may be affected by topology changes elsewhere in the network. Similar can happen with MST if it is sharing an instance with other VLANs. You also risk interacting with the SP's STP (if they haven't disabled). If you use L2, I would recommend disabling STP for the VLAN/Etherchannel and enabling BPDU filter. Alternatively, configure the Etherchannel to be an Edge Port (PortFast).
If you configure the Etherchannel as L3, it will not participate in STP. It will start forwarding as soon as the Etherchannel is brought up and will not be tied to your STP topology or that of your SP. L3 Etherchannel will be a lot more stable without requiring additional configuration.
I would recommend going with an L3 Etherchannel.